The description of the blade is very appropriate: according to the patent information disclosed at present, the longest battery can be more than two meters, which looks really like a blade combined with a width of more than ten centimeters and a thickness of less than two centimeters. This technological innovation has become a new breakthrough in the development of new energy industry in terms of safety, endurance, performance and cost reduction.
Blade batteries have obvious advantages.
BYD invented this special battery in order to make up for the shortcomings of lithium ferrous phosphate, and at the same time give full play to the advantages of lithium ferrous phosphate against the ternary lithium camp. Compared with the traditional iron battery, the volume specific energy density is increased by 50%, and the vehicle life can reach more than one million kilometers.
BYD said that through structural innovation, the "blade battery" can skip the "module" when grouping, which greatly improves the volume utilization rate and finally achieves the design goal of loading more batteries in the same space. Compared with the traditional modular battery pack, the volume utilization rate of "blade battery" has increased by more than 50%, and the cruising range has reached the same level as that of high-energy ternary lithium battery. The length can be adjusted according to different models and different battery pack shapes, and the range of 60cm-250cm can be realized.
While the mass energy density and volume energy density of the system are greatly improved, the complexity of the battery system is greatly reduced because the intermediate structure of "module" is removed, which also brings higher product stability and lower failure rate.
After removing the module, the advantages of the blade battery are also obvious:
1, higher energy density
As can be seen from the table, ternary lithium batteries (nickel-cobalt-aluminum batteries or nickel-cobalt-manganese batteries) have higher energy density, but lower safety. Lithium iron phosphate battery has a longer life and is safer, but its energy density is only about 80% of ternary lithium battery. Blade battery combines the advantages of both. The blade battery adopts the long battery core scheme, which can greatly improve the volume utilization rate of the battery pack, and the volume energy density can be increased by up to 50%, thus solving the problem of low volume specific energy density of lithium iron phosphate battery.
2, the cost is lower and the endurance is stronger.
As BYD said: the battery life can run to 600 kilometers and the cost can be reduced by 30%. The battery life is proportional to the power, and the cost reduction mainly lies in that CTP technology can simplify the production process and improve the production efficiency, thus greatly reducing the manufacturing cost of power batteries. According to the calculation, the high endurance cost of a BYD e2 with a price of 6,543,800 yuan can be reduced by about 6,543,800 yuan, while the BYD Tang EV with a price of 300,000 yuan can be reduced by 20,000 yuan.
Innovation of lithium iron phosphate battery
"Erase the word' spontaneous combustion' from the dictionary of new energy vehicles." ? Wang Chuanfu, chairman and president of BYD Group, used the word "thorough" as a qualification, indicating that the most important driving significance of blade batteries is safety.
At the press conference, BYD did not introduce the technical details and performance parameters of the blade battery too much, but showed everyone how safe the blade battery was by means of "acupuncture+fried eggs". BYD played a video comparing the acupuncture experiments of three kinds of batteries: under the same test conditions, the temperature of ternary lithium battery changed dramatically at the moment of acupuncture, and the surface temperature quickly exceeded 500℃, resulting in extreme thermal runaway-intense combustion, and the eggs on the battery surface were blown up; After the traditional lithium iron phosphate battery was punctured, there was no open flame and smoke, the surface temperature reached 200℃~400℃, and the eggs on the battery surface were burnt by high temperature. BYD's "Blade Battery" has no open flame and smoke after penetration, and the surface temperature of the battery is only about 30-60℃. The eggs on the surface of the battery have not changed and are still in a flowable liquid state.
The blade battery with lithium ferrous phosphate formula can not be afraid of "sticking". First, because of its thin sheet shape, the steel needle has a small degree of short circuit after penetration, less abnormal heating and a large heat dissipation area; Secondly, it is because the formula of lithium ferrous phosphate is inherently more stable than lithium ternary.
Furthermore, the blade battery is actually the optimization and innovation of lithium iron phosphate battery.
A few years ago, lithium iron phosphate battery was left behind by ternary lithium battery with higher energy density but poor thermal stability in the cruising range competition of new energy passenger car manufacturers because of its relatively low energy density. Ternary lithium batteries have gradually become the mainstream of new energy passenger cars because of their better cruising range, and lithium iron phosphate batteries are more used in commercial vehicles.
In the new energy passenger car market, most batteries use ternary lithium batteries, while the market share of lithium iron phosphate batteries is declining.
However, Tesla's ternary battery was widely known after the Shanghai basement was burned last year. Before that, 20 17? In 2008, an electric car of the Croatian supercar brand Rimac overturned and caught fire, burning for a full 5? God, that's shocking. In addition, there are many cases of spontaneous combustion of electric vehicles in China, and the safety caused by these spontaneous combustion events has become a big weakness for electric vehicles to please consumers.
Byd Han electric vehicle proving ground
From the macro perspective of industry development, the birth of "blade battery" redefines the safety standards of new energy vehicles. With higher product stability and lower failure rate, it leads the global power battery safety to a new height.
Previously, BYD married Daimler and held hands with Toyota, and its electrification ability has long been recognized by the world's top peers. ? "Almost all the car brands you can think of are discussing cooperation plans based on blade battery technology with us. I believe that everyone will see and hear more exciting news about blade batteries soon. " He Long, vice president of BYD Group and chairman of Foday Battery, said. At the same time, BYD announced the establishment of five "Foday Department" subsidiaries-Foday Battery, Foday Power Supply, Foday Technology, Foday Vision and Foday Mould to further accelerate the global sales of core components of new energy vehicles. So far, BYD has made it clear that all the core technologies and components of BYD's Foday system will be open to the whole new energy automobile industry, benefiting the industry and consumers.
The launch of "Blade Battery" is expected to accelerate the flowering of BYD's open strategy.
Not only has the foreign strategy reached a higher level, but this revolutionary technology will be the first to be carried on BYD Korean EV models. As the flagship car leading the "dynasty family", BYD Han EV is expected to be put into production in June this year. In terms of appearance, the design of BYD Korean EV is very dynamic and fashionable, and the front face is opposite to Dragon. Face's design style was upgraded again, and the closed net was replaced. The headlight group becomes sharp and slender, and is closely connected with the middle net. The lines on the front wall are simplified, and the design of the whole vehicle is very avant-garde.
The Korean EV on the side of the car body adopts a unique low wind resistance rim, which is also a five-spoke shape that consumers like to move. It is worth noting that the new car also uses a hidden door handle design.
In terms of interior, according to the previous official map, it can be seen that the dashboard and central control screen of the new car adopt large-size LCD screens. Judging from the details of the buttons on the left side of the steering wheel and the bottom of the central control screen, the screen still adopts BYD's iconic rotatable design, which continues the consistent sense of technology in the interior of BYD family models.
In terms of power, BYD Korea EV will provide single-motor two-wheel drive and dual-motor four-wheel drive models, in which the single-motor version is equipped with the maximum power 163kW, the NEDC cruising range is 605km, and the fuel consumption per 100km is14.1kwh/100km; The maximum power of the front/rear motor of the dual-motor version is 163kW and 200kW respectively, the cruising range of NEDC is 550km, and the power consumption per 100km is 15.4kWh/ 100km.
New energy brands on the cusp are full of opportunities and challenges. In the face of a series of basic problems such as financing and delivery, BYD's efforts to upgrade its technology in a down-to-earth manner are commendable. Taking the precipitation of lithium ferrous phosphate technology as the admission ticket for the next stage, the turning window period of electric vehicle industry is of great significance.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.